20712342 has 32 divisors (see below), whose sum is σ = 47642112. Its totient is φ = 5880384.

The previous prime is 20712331. The next prime is 20712343. The reversal of 20712342 is 24321702.

It is a super-2 number, since 2×20712342² = 858002222249928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5538 + ... + 8490.

It is an arithmetic number, because the mean of its divisors is an integer number (1488816).

Almost surely, 2^20712342 is an apocalyptic number.

20712342 is an abundant number, since it is smaller than the sum of its proper divisors (26929770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20712342 is a wasteful number, since it uses less digits than its factorization.

20712342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20712342 is about 4551.0814099508. The cubic root of 20712342 is about 274.6268967801.

The spelling of 20712342 in words is "twenty million, seven hundred twelve thousand, three hundred forty-two".