20434993624 has 8 divisors (see below), whose sum is σ = 38315613060. Its totient is φ = 10217496808.

The previous prime is 20434993619. The next prime is 20434993627. The reversal of 20434993624 is 42639943402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434993627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277187094 + ... + 1277187109.

Almost surely, 2^20434993624 is an apocalyptic number.

It is an amenable number.

20434993624 is a deficient number, since it is larger than the sum of its proper divisors (17880619436).

20434993624 is a wasteful number, since it uses less digits than its factorization.

20434993624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554374209 (or 2554374205 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 20434993624 in words is "twenty billion, four hundred thirty-four million, nine hundred ninety-three thousand, six hundred twenty-four".