20661463 has 2 divisors, whose sum is σ = 20661464. Its totient is φ = 20661462.

The previous prime is 20661437. The next prime is 20661523. The reversal of 20661463 is 36416602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20661463 - 2¹³ = 20653271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20661763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10330731 + 10330732.

It is an arithmetic number, because the mean of its divisors is an integer number (10330732).

Almost surely, 2^20661463 is an apocalyptic number.

20661463 is a deficient number, since it is larger than the sum of its proper divisors (1).

20661463 is an equidigital number, since it uses as much as digits as its factorization.

20661463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20661463 is about 4545.4882026027. The cubic root of 20661463 is about 274.4018425801.

The spelling of 20661463 in words is "twenty million, six hundred sixty-one thousand, four hundred sixty-three".